FAQs

 

Q1: What is an OSPW?

A: OSPW stands for Oversized Pulley Wheel. It refers to a larger-than-standard pulley wheel that replaces the stock pulley on your rear derailleur. By increasing pulley diameter and using higher-quality bearings and materials, an OSPW reduces chain bending and friction, thus enhancing drivetrain efficiency and ride smoothness.

Q2: What are the notable advantages of an OSPW compared to a standard pulley wheel?

A:

  • Lower friction losses: The larger diameter allows the chain to move in a more relaxed path, reducing power loss.
  • Premium materials: Most OSPWs use more wear-resistant and lightweight materials, such as aluminum alloy, carbon fiber, or ceramic bearings.

Q3: I use a Shimano 105/Ultegra/Dura-Ace setup. Can I install this OSPW?

A: In most cases, yes. You can check the product compatibility list on the product page for details. If you are unsure, simply provide our customer service team with the exact model of your rear derailleur. We will help confirm compatibility.

Q4: How do I install an OSPW? Do I need specialized tools?

A: We recommend having a qualified bike mechanic handle installation to ensure precision and safety. If you are experienced with bike maintenance, you can follow the step-by-step instructions or illustrated guides on our website. Typical tools include:

  • Hex/Allen wrenches (e.g., 2 mm, 2.5 mm, 3 mm, 4 mm)

Q5: Does installing an OSPW require a new or adjusted chain length?

A: Because an OSPW features larger pulley wheels, increasing chain length often helps optimize performance. If possible, adding four extra links can be beneficial. However, if you do not have spare chain links, you can still use your current chain—just check tension. A good test is to place the drivetrain in the largest chainring + largest cog and see if there is enough rear derailleur tension. When in doubt, consult a professional mechanic to evaluate and adjust.

Q6: What details should I pay attention to when adjusting the rear derailleur after installation?

A:

  1. B-screw adjustment: Larger pulleys need more precise clearance control.
  2. High/low limit screws: Recalibrate them after installation for accurate shifting.
  3. Fine-tuning: If you notice chain skipping or unusual noise, micro-adjust the rear derailleur accordingly.

Q7: How do I clean and lubricate an OSPW?

A: After each long ride or whenever you ride in harsh conditions, remove dirt and debris with a soft brush or bike-specific cleaner. Wipe the OSPW dry with a clean cloth, then apply a suitable chain lube. Avoid aiming high-pressure water directly at the bearing area to prevent water intrusion.

Q8: How often should I perform maintenance?

A: Under normal road conditions, a basic inspection and cleaning every 200–300 km is recommended. In sandy or wet climates, consider more frequent maintenance—such as a quick cleaning after each ride—to keep everything running smoothly.

Q9: What should I do if the OSPW makes noise or feels loose during use?

A:

  1. Check if your chain, chainrings, or cassette are excessively worn.
  2. Inspect whether the OSPW mounting bolts are loose, or if the bearings are overly worn.
  3. If necessary, remove the OSPW for cleaning and re-lubricate the bearings. Should the issue persist, please contact our customer support for further assistance.

Q10: How much efficiency or power savings can an OSPW actually provide?

A: Based on various third-party tests and real-world race data, installing an OSPW can save roughly 2–5 watts under high-load cycling (depending on gear ratio, riding environment, and individual factors). For competitive cyclists, this can be a meaningful advantage in races.

Q11: Do any professional teams or riders use your OSPWs?

A: Yes. Our products have been adopted by several professional and semi-professional riders, proving their durability and performance across various events.

Q12: Shifting feels less smooth after installing the OSPW. What might be the cause?

A: Common causes include:

  • Chain length is too short or too long.
  • The B-screw has not been adjusted properly.
  • Cable tension or limit screws are set incorrectly.
  • The rear derailleur hanger is bent or misaligned.

We recommend systematically checking each factor and referring to our official installation guide for fine-tuning.

Q13: What type of bearing is used in this OSPW?

A: We use high-grade stainless steel inner and outer rings combined with silicon nitride ceramic balls. Ceramic balls offer superior rolling performance and reduced weight, while the stainless steel construction provides durability and easier maintenance.

Q14: Is there any risk of rust or corrosion?

A: Most parts are made of anodized aluminum alloy or stainless steel with anti-corrosion treatment. Under normal circumstances, rust or corrosion is unlikely. However, if you ride in very wet conditions, be sure to clean and dry your drivetrain regularly to prolong its lifespan.

Q15: If I receive a product with quality issues, can I return or exchange it?

A: Yes. If a defect is confirmed to be due to manufacturing or shipping damage, we will cover return shipping costs and offer a free replacement or refund. The steps are:

  1. Contact our customer service with photos and a detailed description of the issue.
  2. Obtain a Return Merchandise Authorization (RMA) number.
  3. Return the product as instructed. Once verified, we will proceed with the replacement or refund.

Q16: What if I want to exchange the product for a different size or color?

A: If you find you need a different specification after receiving your order, please confirm availability with our support first. If it is not a quality-related issue, you may be responsible for any additional shipping costs associated with the exchange.

Q17: How long does it take to process a refund?

A: Once we receive and inspect the returned item, we typically process refunds within 5–7 business days. The exact time may vary depending on your payment method, but generally we refund via the same method used for your original payment.

Q18: Is group purchasing or dealership cooperation supported?

A: Absolutely. We welcome professional teams, clubs, or bike shops interested in group buys or dealership partnerships. For bulk orders or distributorship details, please contact our sales team with your proposed quantities and cooperation ideas.